This sounds like a section of a document protected for forms. Can you type in the area where this happens?

Thank you for your reply.Yes I can type in that area and use everything except the tab key.Upon further reading I believe that my document got formatted somehow which I don't know how to change or correct.One bit of advice I read was to save the document as plain text and this gets rid of all the formatting - which I have done and now after 5 hours of pulling my hair out I can now use the tab key!
Ciao 4 Now!